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Search Results: 1 - 10 of 5949 matches for " Akemi Yamagata;Nunes "
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Nonlinear models for describing the Citrus Variegated Chlorosis in groves of two counties at northwestern Paraná state, Brazil = Modelo n o-linear para a curva de progresso de incidência da Clorose Variegada dos Citros (CVC) em dois municípios da regi o noroeste do Estado do Paraná
Clara Matiko Ueda,Akemi Yamagata Yamamoto,William Mário de Carvalho Nunes,Carlos Alberto Scapim
Acta Scientiarum : Agronomy , 2010,
Abstract: In Brazil, the production of sweet oranges has been threatened by the Citrus Variegated Chlorosis (CVC) incited by the gram-negative bacterium Xylella fastidiosa (Wells). Commercial citrus groves in two counties at the Northwestern Paraná state were evaluated to estimate the disease progression by using parameterizations of nonlinear models. Groves of Citrus sinensis Osbeck, variety “Pêra”, “Valência”, “Natal” and “Folha Murcha” had all the plants evaluated for the presence of disease symptoms. Thereafter, different parameterizations of the Logistic and Gompertz models were fitted to these data. The goodness of fit was evaluated by the intrinsic (IN) and parameter-effects (PE) curvatures of Bates and Watts, the bias of Box and the Hougaard measures of skewness. In Loanda, the best model was the Fermi-Dirac, and in Nova Esperan a the data were best fitted to the parameterization L5, which is also a parameterization from the Logistic model. A citricultura é afetada por diversas doen as, dentre as quais a Clorose Variegada dos Citros (CVC) causada pela bactéria Xylella fastidiosa (Wells). Para a regi o noroeste do Estado do Paraná, onde foi avaliada a CVC, prop e-se encontrar modelos n o-lineares de curvas de progresso de incidência da CVC que representem o percentual de plantas acometidas pela doen a. Para avaliar o comprometimento dos pomares com rela o à doen a, foram escolhidos pomares comerciais em dois municípios, onde foi determinada a propor o de plantas doentes. Foram selecionados talh es de laranja doce (Citrus sinensis Osbeck) nas variedades “Pêra”, “Valência”, “Natal” e “Folha Murcha” e a avalia o de todas as plantas do talh o foi realizada visualmente em rela o à presen a ou à ausência de sintomas de CVC. Para estimar o modelo que melhor se ajustou aos dados de progresso da propor o da doen a em cada talh o, foram considerados modelos n o-lineares decrescimento sigmoidal, o logístico e o de Gompertz, conforme sugerido na literatura. A escolha do melhor modelo foi com base em medidas de curvatura intrínseca e paramétrica de Bates e Watts, viés de Box e medida de assimetria de Hougaard. O modelo que melhor ajustou aos dados de Loanda foi o modelo de Fermi-Dirac e aos dados de Nova Esperan a foi outra reparametriza o do Modelo Logístico, denominado de L5.
Nonlinear models for describing the Citrus Variegated Chlorosis in groves of two counties at Northwestern Paraná State, Brazil
Ueda, Clara Matiko;Yamamoto, Akemi Yamagata;Nunes, William Mário de Carvalho;Scapim, Carlos Alberto;Guedes, Terezinha Aparecida;
Acta Scientiarum. Agronomy , 2010, DOI: 10.4025/actasciagron.v32i4.11625
Abstract: in brazil, the production of sweet oranges has been threatened by the citrus variegated chlorosis (cvc) incited by the gram-negative bacterium xylella fastidiosa (wells). commercial citrus groves in two counties at the northwestern paraná state were evaluated to estimate the disease progression by using parameterizations of nonlinear models. groves of citrus sinensis osbeck, variety "pêra", "valência", "natal" and "folha murcha" had all the plants evaluated for the presence of disease symptoms. thereafter, different parameterizations of the logistic and gompertz models were fitted to these data. the goodness of fit was evaluated by the intrinsic (in) and parameter-effects (pe) curvatures of bates and watts, the bias of box and the hougaard measures of skewness. in loanda, the best model was the fermi-dirac, and in nova esperan?a the data were best fitted to the parameterization l5, which is also a parameterization from the logistic model.
Sensory Evaluation Spectrum Method as a Descriptive Sensory Analysis  [PDF]
Yoshie Yamagata, Yoshiaki Sugawara
Psychology (PSYCH) , 2014, DOI: 10.4236/psych.2014.514170
Abstract: Sensory evaluation is used to measure consciousness, and primarily developed in experimental and mathematical psychology. Sensory experiences can be reported using verbal (semantic) methods. This paper presents an overview of our semantic research achievements over the past decade, focusing on methodological attempts for substantiating the measure as a descriptive sensory analysis. Two types of studies that deserve particular attention are detailed: 1) evaluation of the efficacy of photo catalytic elimination of stains or bio-aerosols in air using TiO2 and photo catalytic deodorizing properties of a TiO2-type deodorizer; and 2) evaluation of the differential discrimination of perceived odor quality for a given aroma while inhaling the fragrances of essential oils. Both studies are based on semantic responses of participants. The perceived sensory attributes in the participants can be represented by a sensory spectrum: a bar graph whereby the mean of the impressions is plotted against the setting semantic impression descriptors. In the former study, we provide a background on the sensory evaluation spectrum method and discuss its implementation as a measure of descriptive sensory analysis. The latter study additionally demonstrates how statistical defects were overcome when spectra were not statistically significant.
Grid Convergence Property of Three-Dimensional Measurement-Integrated Simulation for Unsteady Flow behind a Square Cylinder with Karman Vortex Street  [PDF]
Takayuki Yamagata, Toshiyuki Hayase
Journal of Flow Control, Measurement & Visualization (JFCMV) , 2016, DOI: 10.4236/jfcmv.2016.44012
Abstract: The purpose of this study was to clarify grid convergence property of three-dimensional measurement-integrated (3D-MI) simulation for a flow behind a square cylinder with Karman vortex street. Measurement-integrated (MI) simulation is a kind of the observer in the dynamical system theory by using CFD scheme as a mathematical model of the system. In a former study, two-dimensional MI (2D-MI) simulation with a coarse grid system showed a fairly good result in comparison with a 2D ordinary (2D-O) simulation, but the results were degraded with grid refinement. In this study, 3D-MI simulation and three-dimensional ordinary (3D-O) simulation were performed with three grid systems of different grid resolutions, and their grid convergence properties were compared. As a result, all 3D-MI simulations reproduced the vortex shedding frequency identical to that of the experiment, and the flow fields obtained were very close, within 5% difference between the results, while the results of the 3D-O simulations showed variation of the solution under convergence. It is shown that the grid convergence property of 3D-MI simulation is monotonic and better than that of 3D-O simulation, whereas those of 2D-O and 2D-MI simulations for streamwise velocity fluctuation are divergent. The solution of 3D-MI simulation with a relatively coarse grid system properly reproduces the basic three-dimensional structure of the wake flow as well as the drag and lift coefficients.
Effect of Rotation and Revolution on Performance of Blade-Free Planetary Mixer  [PDF]
Takayuki Yamagata, Nobuyuki Fujisawa
Journal of Flow Control, Measurement & Visualization (JFCMV) , 2019, DOI: 10.4236/jfcmv.2019.71001
Abstract: In this study, flow structures and mixing performance in a blade-free planetary mixer, which combines rotation and revolution motions inside a cylindrical vessel, are numerically investigated. Flow fields in the mixer vessel are simulated in a single rotating reference frame with various revolution speeds and a fixed rotation speed. The mixing process is investigated by a Lagrangian particle tracking method and the mixing performance is evaluated based on particle concentration. The results of the numerical simulations show that a vortical flow with an axis inclined with respect to the rotation axis of the vessel is generated by the combined influence of the rotation and revolution motions. The flow structure and vortical flow intensity vary as a function of the precession rate, which is the ratio of the revolution speed to rotation speed. The mixing performance of the blade-free planetary mixer is found to be maximum at aspecific precession rate.
High Emotional Arousal Enables Subliminal Detection of Concealed Information  [PDF]
Akemi Osugi, Hideki Ohira
Psychology (PSYCH) , 2017, DOI: 10.4236/psych.2017.810098
Abstract: The Concealed Information Test (CIT) is an information-detecting technique for criminal investigations. Although it has been shown that emotional arousal plays a specific role in the CIT, the mechanisms by which emotional arousal affects the CIT are unclear. The main purpose of this study was to elucidate the processing pathway for stimuli encoded with emotional arousal in a mock crime before the CIT. In this study, participants viewed emotionally arousing pictures before the mock crime. Participants were assigned randomly to either a high or low emotional arousal group, viewing pictures expected to arouse emotion at a high or low level, respectively. Subsequently, all participants enacted the same mock crime, in which they were instructed to stab a pillow with a sharp-edged tool (e.g., kitchen knife or ice pick) as if to harass a woman lying on a bed. After the antecedent emotional experience, a P300-based CIT was conducted using subliminal and supraliminal presentation methods. The results revealed a significantly greater CIT effect on the P300 event-related potential (ERP) component in the High Arousal group compared with the Low Arousal group, under both subliminal and supraliminal conditions. The detection of concealed information was successful only in the High Arousal group under subliminal conditions, whereas detection was successful regardless of the emotional arousal group under supraliminal conditions. These results provide strong evidence that emotional arousal can increase P300 amplitude during responses to concealed information in the CIT. This suggests that concealed information may be automatically processed via the bottom-up route in the CIT, but only when it is encoded with high emotional arousal.
Interfacial adsorption phenomena of the three-dimensional three-state Potts model
Atsushi Yamagata
Physics , 1992, DOI: 10.1088/0305-4470/26/9/008
Abstract: We study the interfacial adsorption phenomena of the three-state ferromagnetic Potts model on the simple cubic lattice by the Monte Carlo method. Finite-size scaling analyses of the net-adsorption yield the evidence of the phase transition being of first-order and $k_{\rm B} T_{\rm C} / J = 1.8166 (2)$.
Critical phenomena of the hard-sphere lattice gas on the simple cubic lattice
Atsushi Yamagata
Physics , 1995, DOI: 10.1016/0378-4371(95)00282-0
Abstract: We study the critical phenomena of the hard-sphere lattice gas on the simple cubic lattice with nearest neighbour exclusion by the Monte Carlo method. We get the critical exponents, $\beta / \nu$ = 0.313(9) and $\gamma / \nu$ = 2.37(2), where $\beta$ is the critical exponent for the staggered density, $\gamma$ for the staggered compressibility, and $\nu$ for the correlation length.
Absence of re-entrant phase transition of the antiferromagnetic Ising model on the simple cubic lattice: Monte Carlo study of the hard-sphere lattice gas
Atsushi Yamagata
Physics , 1994, DOI: 10.1016/0378-4371(95)00051-8
Abstract: We perform the Monte Carlo simulations of the hard-sphere lattice gas on the simple cubic lattice with nearest neighbour exclusion. The critical activity is estimated, $z_{\rm c} = 1.0588 \pm 0.0003$. Using a relation between the hard-sphere lattice gas and the antiferromagnetic Ising model in an external magnetic field, we conclude that there is no re-entrant phase transition of the latter on the simple cubic lattice.
Finite-size effects of dimensional crossover in quasi-two-dimensional three-state Potts model
Atsushi Yamagata
Physics , 1994, DOI: 10.1016/0378-4371(94)00274-W
Abstract: A nearest neighbour spin pair of the quasi-two-dimensional three-state Potts model interacts with the strength $J(>0)$ in the $xy$-plane and with $\lambda J$ $(0\le \lambda \ll 1)$ in the $z$-axis. The phase transition is of second-order when $\lambda = 0$ and is of first-order when $\lambda > 0$. The dimensional crossover occurs with a change of the order of the phase transition. We study the finite-size effects of the phenomenon by using a Monte Carlo method with a multi-spin coding technique. The prediction of the finite-size scaling theory is consistent with the Monte Carlo results.
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